Klaviyo
What it is
Lifecycle email and SMS for ecommerce, triggered by what people do in the shop and reported as revenue per flow.
What it’s good at
Behavioural triggers: abandoned checkouts, browse patterns, replenishment windows and back-in-stock alerts fire from shop data without engineering work. Revenue attribution per flow, so the welcome series has a number attached and earns its keep. The Shopify integration runs deep; catalogue, order history and predicted next order are ready for segmentation.
What it costs to own
Someone writes the flows and keeps writing them. A flow set built at launch and left alone drifts away from the catalogue and the offers within a year. List hygiene is a standing job: sunset the unengaged on a schedule, or deliverability sinks and every send earns less. Segments multiply like CRM properties and want the same pruning.
When it’s a poor fit
You sell B2B on a long cycle to a buying committee. Klaviyo models one person buying one product; it has no useful picture of six stakeholders and a procurement stage, and a CRM-native automation tool fits that shape. Or the catalogue is too small for behaviour to trigger on: one product, one purchase per customer, no replenishment cycle. A plain email tool covers that for less attention.
What it sits beside
In an ecommerce stack it replaces the generic email tool. It sits beside Shopify by default, and beside Meta and Google Ads the overlap is attribution: Klaviyo credits its last email and the ad platforms their last click, so the sum exceeds what you banked. In practice one steering number gets chosen.
My experience
On the shops I work with I set the core flows up early, because in my experience it is the revenue that costs least to bring in.